CN2176858Y - Combined bit - Google Patents

Abstract

The utility model relates to a combined drill bit used for milling machines and drilling machines to drill holes with a diameter larger than an original diameter. The combined drill bit comprises a body and blades. A cutter frame provided with the blades is adjusted by special screw bolts along the radial direction of the body, and two blades tilt in different directions relative to the axial line of the body for cutting a groove with a width larger than the thickness of the blades. The utility model can be used for drilling a shallow hole with any diameter in working range.

Description

Combined bit

Combined drill is applied to the larger-diameter shallow bore holes of machine tooling such as bench drill, vertical drill, radial drill, milling machine.

Consult the 20th page of " external product and technology " NO.5 1992, existing drill bit all is processed into smear metal with the material that chisel edge and main cutting edge will punch on the position, makes it to separate from parent the aperture that formation and bit diameter overlap substantially.Its work in-process energy consumption is big, is difficult for improving precision, and to the processing of large diameter hole, precision more be cannot say for sure to demonstrate,prove, and fineness is not high especially; Its diameter can not be adjusted, and the hole of each size all must be equipped with the drill bit of a specific dimensions; The aperture that it can be processed by device-restrictive is less, can only bore aperture below the 13mm as bench drill.2000 serial drill bits of the U.S. and Japan do not cut the core in hole, exchange on basic body 3 blades that diameter is different are installed, and cover is equipped with in the outside, and one can only process the shallow bore hole of three different-diameters to drill bit.

Combined drill is used in the hole that can process on the lathes such as milling machine, various drilling machines than original larger diameter; Two blades of a combined drill can be processed the hole of arbitrary dimension in its range of work.

Combined drill is achieved in that two knife rests in the body groove, each fixes a blade on the knife rest, and by the radiai adjustment of special bolt along body, base compresses knife rest by bolting to knife rest in the body groove.The blade head is narrow, root is wide, and its protuberate basic unit is the face of cylinder back to the one side of body axis.Fix it then according to the radial position that two blades are regulated by special bolt in need processing aperture, during work blade incision material parent to wear through hole; Cut pore-forming outward layer by layer by the lining during processing blind hole.Because intensity effect, blade root thickness should be than the thin thickness of cutter head, for eliminating the friction after blade is cut part, the relative body axis of two blades becomes different directions to tilt, and the groove width that cuts out is greater than the maximum ga(u)ge of blade.

Combined drill misaligns the heart and partly cuts, and energy consumption is little, the machining accuracy height; Two blades of combined drill can be processed the hole of arbitrary dimension in its range of work, and hole that needn't each size is equipped with a drill bit, can save tool expense; Combined drill is used in the hole that can process on the milling machine than original larger diameter, can enlarge the working ability of existing equipment, and can process the maximum diameter of hole as existing Z412 drilling machine is 12mm, can process the hole that the aperture is about 12mm～35mm behind the adapted combined drill.Since when work blade vibration and the influence of intensity, combined drill can only working depth less than the hole of 30mm.

Fig. 1 is the elevation cross-sectional view of combined drill.

Fig. 2 is the A-A profile of Fig. 1.

See Fig. 1, Fig. 2, combined drill is made up of bolt (1), body (2), knife rest (3), special bolt (4), interior hexagonal cylinder head bolt (5), base (6), blade (7) etc.It is interior also fixing with interior hexagonal cylinder head bolt (5) that knife rest (3) and each two on blade (7), blade (7) are contained in the groove of knife rest (3).Special bolt (4) groove embeds in base (6) groove, turns the position that its six square toes just can be regulated knife rest (3).The effect of bolt (1) is that firm banking (6) compresses knife rest (3), and blade (7) head is narrow, wide its intensity of favourable reinforcement of root; Blade (7) protuberate basic unit (6) is the face of cylinder back to the one side of body (2) axis, and its circular diameter is equal to or less than the minimum diameter that combined drill can be processed.Two blades (7) body (2) axis relatively become different directions to tilt, as shown in Figure 1.It is such using the combined drill process: establishing and needing the diameter of the single through hole of processing is d, (1) loosers a bolt, regulate L1 and L2 by special bolt (4), make L1=L2=(L-d)/2+(0.2～0.5), (1) then tights a bolt, when the aperture that combined drill processes is slightly less than d, (1) again loosers a bolt, finely tuning outward-dipping one of relative axis in two blades (7) suitably reduces L1, fix it, aperture after the processing just meets the requirement of d once more, and fineness is fine.If the continuous through hole of a plurality of same diameter of processing, after then only needing process first qualified hole by single hole processing method of adjustment, blade (7) but other the hole of rapid processing that just immobilizes, position, combined drill processing blind hole process is such; With Z412 drilling machine processing diameter is that φ 30mm is that the blind hole of 20mm is an example deeply, be the hole of φ 12mm with spiral bit processing diameter earlier, the hole that processes about φ 16mm for the first time with combined drill processes the hole of φ 20mm for the second time again, adjust the position of combined drill blade (7) successively, just can process the blind hole that diameter is 30mm at last by lining cutting layer by layer outward.Blade material is selected toughness and thermohardening material preferably for use, as W6Mo5Cr4V2 or W18Cr4V, or cutter head embedding carbide alloy, cutting speed is advisable with 0.5～1.5m/s.

Claims (2)

1, a kind of combined drill, form by body (2), blade (7) etc., the knife rest (3) that it is characterized in that installing blade (7) is in the groove of body (2), and special bolt (4) is along the radiai adjustment knife rest (3) of body (2), and base (6) is by bolt (1) knife rest (3) that is fixed and clamped.

2, by the described combined drill of claim 1, it is characterized in that the head of blade (7) is narrow, root is wide, its protuberate basic unit (6) is the face of cylinder back to the one side of body (2) axis, and two blades (7) axis of body (2) relatively become different directions to tilt.

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